Purity is to timbre as is to frequency . . pitch frequency . . loudness amplitude . . pitch amplitude . . hertz

The correct answer *(to whoever may need it in the future)* is actually:

Purity is to timbre as frequency is to pitch.

the correct answer is option A , Frequency is to pitch

The relation between timbre and purity is directly proportional, which means the better the timbre the more pure is the sound. Like wise the relation between the frequency and pitch is also directly proportional, high frequency sound has high pitch , while low frequency sound has low pitch. Since the nature of relationship between the two set of words that is “purity and timbre” and “ frequency and pitch “ is same, the best option in this case could be option A.

the titanic would be the correct answer

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.